Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/956a9d7e094c
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #14605 from EverythingMe/949392-music2

Bug 949392 - [e.me] 'Music2' removed from 'Music' collection when adding a web app [r=ranbena]

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https://hg.mozilla.org/integration/gaia-central/rev/3a63e79f5c02
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 949392 - [e.me] 'Music2' removed from 'Music' collection when adding a web app [r=ranbena]